Pipe coupling



2 sheetsheet l www L l n l Mange@ J W' STAGGERS PIPE COUPLING FiledSep.. l5 1942 Jan. 4, 1944.

2 Sheets-Sheet .2

Jan- 4, 1944- J. w. sTAGGERs 'PIPE coUPLI'NG Filed sept. 15 1942 JWQQTSIIIIIAII..

Patented Jan. 4, 1944 UNITED STATES l PATENT CFFICE PIPE COUPLING JohnW. Staggers, Washington, D. C.

Application September 15, 1942, Serial No. 458,368

4 Claims.

This invention relates to a pipe joint or couplng.

It is particularly aimed to provide a construction of joint or couplingfor sections or lengths of pipe, such as cement pipe, which includes anovel clamping sleeve contracted about the pipe sections or lengths,coacting with means on the latter to draw them together, and coactingwith means to retain a sealing medium which remains liquid, tacky orpermanently effective in order to seal the joint especially if relativemovement of the pipe sections or lengths should occur during use.

The more specific objects and advantages will become apparent from aconsideration of the description following taken in connection withaccompanying drawings illustrating an operative embodiment.

In said drawings- Figure 1 is a view in elevation showing lengths orsections of pipe connected by my invention;

Figure 2 is a longitudinal sectional View taken on the line 2--2 ofFigure 1;

Figure 3 is a transverse sectional View taken on the line 3--3 of Figurel;

Figure 4 is a fragmentary longitudinal sectional view similar to Figure2 but showing the use of a modified form of clamping means;

Figure 5 is an end elevation of one form of coupling sleeve and Figure 6is an end elevation of a final form of split coupling sleeve which maybe used.

Referring specifically to the drawings wherein like reference charactersdesignate like or similar parts, two lengths or sections of pipe areillustrated at IU and are to be taken as conventional and of any desiredsize, being made for instance of concrete. At one end, said pipesections are outwardly flared or tapered at portions II and at theirother ends, they are in the reverse direction similarly outwardly flaredor tapered at portions I 2. Beyond the portions I2, end portions I3project from the pipe, being of reduced diameter and preferablyterminally of wedge or pointed shape as at lll.

The opposite ends of the pipe sections I are interiorly channeled or cutaway at I5, to a less depth than the length of the extensions I3 but ofapproximately the same diameter so that the extensions will enter thechannels I with the wedge terminals I4 in engagement withcorrespondingly shaped grooves I6 that begin at terminals of thechannels.

It will be noted that the extensions I3 cannot and hence when adjacentpipes or sections are joined, an outer circumferential groove I'I isprovided and such groove constitutes a reservoir for sealing compound I8which preferably is of such nature as to remain permanently liquid,viscid or tacky, to effectively seal all adjacent joints, and especiallyshould the pipe sections have relative movement after continued use,will automatically adapt itself to the changed position of the pipesections and maintain them effectively joined and sealed.

Disposed around the interfitted ends of the pipe sections and extendinga distance therefrom is a coupling sleeve I9 which may be of metal, asuitable plastic or the equivalent. As shown in Figure 3, in particular,coupling sleeve I9 may be in a single piece having a single split at 20on a line diametrically of the pipe. Such sleeve interiorly andcentrally has an inwardly extending continuous rib 2l of less depth thanthat of the reservoir or groove I8 and extending into the latter.Otherwise the inner surface of the coupling sleeve I9 conforms to theadjacent outer surface portions of the pipes or sections I0 in thatsurface portions 22 thereof are cylindrical concentrically with thecenter of the pipe and surface portions 23 thereof are outwardly taperedin opposite direction.

Exteriorly, the coupling sleeve I9 has diverging tapered surfaces at 24to each of which a clamping ring 25 is removably applied, preferablyhaving internal tapered surfaces 26 on angles corresponding to thetapered surfaces 24. The clamping rings 25 may be made in one or morepieces as preferred but as shown, are made in halves which aredetachably joined together by bolts 21 passed through openings 28 inlugs 29 on the sections, such bolts at one end having heads 30 and atthe other end having nuts 3l screw threaded thereon, which heads andbolts abut the respective adjacent lugs. Said clamping rings 25 areadapted to be drawn tightly together in any suitable manner therebycompressing the vcoupling sleeve I9 about the pipe lengths or sectionsand it will be realized that such contraction will through the coactionof the tapered surfaces between the pipe lengths or sections andcoupling sleeve at the interior of the latter impart a movementlongitudinally to the pipe sections to draw them together and not onlycause the coupling sleeve to intimately t and embrace the same but tointimately engage the terminal end I4 in the groove I6 and in contactwith the wall providing it. To this end, bolts 32 may be passed throughopenings 33 at suitable intervals as in Figure 3.

in the clamping rings, such bolts being of conventional form havingheads 34 at one end and nuts 35 screwed on the other end.

Various changes may be resorted to provided they fall within the spiritand scope of the invention and for instance as shown in Figure 4 Wherethe screw threads of bolt 32, here designated 36 are engaged with screwthreads in the opening 31 of the adjacent clamp rings 38. Otherwise theform of Figure 4 `corresponds .exactly with. that iirst described.

A clamping ring may be of different forms. In lieu of that at I9 havinga single split, such ring may be in two parts or have two splits as at20 in Figure 5. Internally and externally, the coupling sleeve of Figure5 corresponds identically with that used in the form of Figures l1 to 4and the same reference characters have otherwise been applied thereto.

In Figure 6, the modified form of coupling sleeve has a single splittherethrough as at 20a, the same being on a bias rather than diametricThis coupling sleeve of Figure 6 if desired may also be in two partswith two slits Aor splits like 20a, corresponding to the splits at 20'in Figure 5, but with both splits 20a on a bias but preferably parallelto each other.

I claim as my invention:

l. In combination with pipe ends, one of said ends having an externallyreduced extension, the other end being cut away and having a shoulder,said extension being longer than said cut-away portions whereby itfunctions to bridge and space said ends to provide a reservoir for yasealing medium, external coupling means for said ends 4bridging andclosing said-reservoir, consisting of a split sleeve having divergingtapered portions, and clamping elements movable .along said portions tocontract the split sleeve.

2'. In combination with pipe ends, one of said ends having an externallyreduced extension, the other end being cut away and having a shoulder,.said extension being longer than said cut-away yportions whereby itfunctions `to bridge and space said ends to provide a reservoir for asealing medium, external coupling means for said ends bridging andclosing said reservoir, consisting of a split sleeve, and clampingelements movable along said portions to contract the split sleeve, saidsplit sleeve and pipe ends having surfaces in engagement at divergingangles eifective to draw the pipe ends toward each other.

3. In combination with pipe ends, one of said ends having .anVexternallyreduced extension, the

-other end'being `cut away and having a'shoulder,

said extension being longer than said cut-away portions whereby itfunctions to bridge and space said ends to provide a reservoir for asealing medium, external coupling means for said ends bridging `andclosing said reservoir, consisting of a split sleeve, and clampingelements movable ialong :saidportions'to contract the split sleeve,

said split sleeve and pipe ends having surfaces in engagement atdiverging angles effective to draw vthe jpipe Iends toward each other,and 'said coupling sleeve having an internally extending rib of less`depth .than the reservoirand partly occupying the latter, .said i rib.being annular and having `opposite sides contacting adjacent walls of`the pipe ends.

f 4. VIn combination withA pipe ends,.one of'said ends having Aanexternally reduced extension, said extension being longer 4.than said`cut-away portions whereby it functions to bridgefand space said ends.toprovide areservoir for a sealing medium, external coupling means .forsaid ends bridging and closing said'reservoir, consisting rof 'a splitAsleeve and clamping elements movable along said vportions to contract.the-split sleeve, lsaid split sleeve and pipe ends having'surfaces in-engagement at diverging angles effective to draw the pipe ends towardeach other, and -saidecoupling sleeve having an internally extending ribof less depth .than ythe reservoir .and partly.r oc- `cupying .thelatter, said .rib being rannular and having opposite sides lcontactingthe .adjacent walls of the pipe ends.

JQHN v`W. STAGGERS.

